/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002,2003 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include "types.h"
#include "fce.h"
#include "general.h"
#include "driver.h"

#include "palette.h"
#include "palettes/palettes.h"

#include "svga.h"

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

static int ntsccol=0;
static int ntsctint=46+10;
static int ntschue=72;

/* These are dynamically filled/generated palettes: */
pal palettei[64];       // Custom palette for an individual game.
pal palettec[64];       // Custom "global" palette.
pal paletten[64];       // Mathematically generated palette.

static void CalculatePalette(void);
static void ChoosePalette(void);
static void WritePalette(void);
uint8 pale=0;

pal *palo;
static pal *palpoint[8]=
     {
     palette,
     rp2c04001,
     rp2c04002,
     rp2c04003,
     rp2c05004,
     };

void FCEUI_SetPaletteArray(uint8 *pal)
{
 if(!pal)
  palpoint[0]=palette;
 else
 {
  int x;
  palpoint[0]=palettec;
  for(x=0;x<64;x++)
  {
   palpoint[0][x].r=*((uint8 *)pal+x+x+x);
   palpoint[0][x].g=*((uint8 *)pal+x+x+x+1);
   palpoint[0][x].b=*((uint8 *)pal+x+x+x+2);
  }
 }
 FCEU_ResetPalette();
}


void FCEUI_SetNTSCTH(int n, int tint, int hue)
{
 ntsctint=tint;
 ntschue=hue;
 ntsccol=n;
 FCEU_ResetPalette();
}

static uint8 lastd=0;
void SetNESDeemph(uint8 d, int force)
{
 static uint16 rtmul[7]={32768*1.239,32768*.794,32768*1.019,32768*.905,32768*1.023,32768*.741,32768*.75};
 static uint16 gtmul[7]={32768*.915,32768*1.086,32768*.98,32768*1.026,32768*.908,32768*.987,32768*.75};
 static uint16 btmul[7]={32768*.743,32768*.882,32768*.653,32768*1.277,32768*.979,32768*.101,32768*.75};
 uint32 r,g,b;
 int x;

 /* If it's not forced(only forced when the palette changes),
    don't waste cpu time if the same deemphasis bits are set as the last call.
 */
 if(!force)
 {
  if(d==lastd)
   return;
 }
 else   /* Only set this when palette has changed. */
 {
  r=rtmul[6];
  g=rtmul[6];
  b=rtmul[6];

  for(x=0;x<0x40;x++)
  {
   uint32 m,n,o;
   m=palo[x].r;
   n=palo[x].g;
   o=palo[x].b;
   m=(m*r)>>15;
   n=(n*g)>>15;
   o=(o*b)>>15;
   if(m>0xff) m=0xff;
   if(n>0xff) n=0xff;
   if(o>0xff) o=0xff;
   FCEUD_SetPalette(x|0xC0,m,n,o);
  }
 }
 if(!d) return; /* No deemphasis, so return. */

 r=rtmul[d-1];
 g=gtmul[d-1];
 b=btmul[d-1];

 for(x=0;x<0x40;x++)
 {
  uint32 m,n,o;

  m=palo[x].r;
  n=palo[x].g;
  o=palo[x].b;
  m=(m*r)>>15;
  n=(n*g)>>15;
  o=(o*b)>>15;
  if(m>0xff) m=0xff;
  if(n>0xff) n=0xff;
  if(o>0xff) o=0xff;

  FCEUD_SetPalette(x|0x40,m,n,o);
 }

 lastd=d;
}

/* Converted from Kevin Horton's qbasic palette generator. */
static void CalculatePalette(void)
{
 int x,z;
 int r,g,b;
 double s,luma,theta;
 static uint8 cols[16]={0,24,21,18,15,12,9,6,3,0,33,30,27,0,0,0};
 static uint8 br1[4]={6,9,12,12};
 static double br2[4]={.29,.45,.73,.9};
 static double br3[4]={0,.24,.47,.77};

 for(x=0;x<=3;x++)
  for(z=0;z<16;z++)
  {
   s=(double)ntsctint/128;
   luma=br2[x];
   if(z==0)  {s=0;luma=((double)br1[x])/12;}

   if(z>=13)
   {
    s=luma=0;
    if(z==13)
     luma=br3[x];
   }

   theta=(double)M_PI*(double)(((double)cols[z]*10+ (((double)ntschue/2)+300) )/(double)180);
   r=(int)((luma+s*sin(theta))*256);
   g=(int)((luma-(double)27/53*s*sin(theta)+(double)10/53*s*cos(theta))*256);
   b=(int)((luma-s*cos(theta))*256);


   if(r>255) r=255;
   if(g>255) g=255;
   if(b>255) b=255;
   if(r<0) r=0;
   if(g<0) g=0;
   if(b<0) b=0;

   paletten[(x<<4)+z].r=r;
   paletten[(x<<4)+z].g=g;
   paletten[(x<<4)+z].b=b;
  }
 WritePalette();
}

static int ipalette=0;

void FCEU_LoadGamePalette(void)
{
  uint8 ptmp[192];
  FILE *fp;
  char *fn;

  ipalette=0;

  fn=FCEU_MakeFName(FCEUMKF_PALETTE,0,0);

  if((fp=fopen(fn,"rb")))
  {
   int x;
   fread(ptmp,1,192,fp);
   fclose(fp);
   for(x=0;x<64;x++)
   {
    palettei[x].r=ptmp[x+x+x];
    palettei[x].g=ptmp[x+x+x+1];
    palettei[x].b=ptmp[x+x+x+2];
   }
   ipalette=1;
  }
  free(fn);
}

void FCEU_ResetPalette(void)
{
 //if(FCEUGameInfo)
 {
   ChoosePalette();
   WritePalette();
 }
}

static void ChoosePalette(void)
{
    if(FCEUGameInfo.type==GIT_NSF)
     palo=0;
    else if(ipalette)
     palo=palettei;
    else if(ntsccol && !PAL && FCEUGameInfo.type!=GIT_VSUNI)
     {
      palo=paletten;
      CalculatePalette();
     }
    else
     palo=palpoint[pale];
}

void WritePalette(void)
{
    int x;

    for(x=0;x<7;x++)
     FCEUD_SetPalette(x,unvpalette[x].r,unvpalette[x].g,unvpalette[x].b);
    if(FCEUGameInfo.type==GIT_NSF)
    {
     //for(x=0;x<128;x++)
     // FCEUD_SetPalette(x,x,0,x);
    }
    else
    {
     for(x=0;x<64;x++)
      FCEUD_SetPalette(x+128,palo[x].r,palo[x].g,palo[x].b);
     SetNESDeemph(lastd,1);
    }
}

void FCEUI_GetNTSCTH(int *tint, int *hue)
{
 *tint=ntsctint;
 *hue=ntschue;
}

static int controlselect=0;
static int controllength=0;

void FCEUI_NTSCDEC(void)
{
	if(ntsccol && FCEUGameInfo.type!=GIT_VSUNI &&!PAL && FCEUGameInfo.type!=GIT_NSF)
        {
         int which;
         if(controlselect)
         {
          if(controllength)
          {
           which=controlselect==1?ntschue:ntsctint;
           which--;
           if(which<0) which=0;
           if(controlselect==1)
            ntschue=which;
           else ntsctint=which;
           CalculatePalette();
          }
          controllength=360;
         }
	}
}

void FCEUI_NTSCINC(void)
{
                   if(ntsccol && FCEUGameInfo.type!=GIT_VSUNI && !PAL && FCEUGameInfo.type!=GIT_NSF)
                     if(controlselect)
                     {
                      if(controllength)
                      {
                       switch(controlselect)
                       {
                        case 1:ntschue++;
                               if(ntschue>128) ntschue=128;
                               CalculatePalette();
                               break;
                        case 2:ntsctint++;
                               if(ntsctint>128) ntsctint=128;
                               CalculatePalette();
                               break;
                       }
                      }
                      controllength=360;
                     }
}

void FCEUI_NTSCSELHUE(void)
{
 if(ntsccol && FCEUGameInfo.type!=GIT_VSUNI && !PAL && FCEUGameInfo.type!=GIT_NSF){controlselect=1;controllength=360;}
}

void FCEUI_NTSCSELTINT(void)
{
 if(ntsccol && FCEUGameInfo.type!=GIT_VSUNI && !PAL && FCEUGameInfo.type!=GIT_NSF){controlselect=2;controllength=360;}
}

void FCEU_DrawNTSCControlBars(uint8 *XBuf)
{
 uint8 *XBaf;
 int which=0;
 int x,x2;

 if(!controllength) return;
 controllength--;
 if(!XBuf) return;

 if(controlselect==1)
 {
  DrawTextTrans(XBuf+128-12+180*256, 256, (uint8 *)"Hue", 0x85);
  which=ntschue<<1;
 }
 else if(controlselect==2)
 {
  DrawTextTrans(XBuf+128-16+180*256, 256, (uint8 *)"Tint", 0x85);
  which=ntsctint<<1;
 }

 XBaf=XBuf+200*256;
 for(x=0;x<which;x+=2)
 {
  for(x2=6;x2>=-6;x2--)
  {
   XBaf[x-256*x2]=0x85;
  }
 }
 for(;x<256;x+=2)
 {
  for(x2=2;x2>=-2;x2--)
   XBaf[x-256*x2]=0x85;
 }
}
